Influence of rotating directions on hydro-thermal characteristics of a two-pass parallelogram channel with detached transverse ribs

T. M. Liou, C. Y. Huang, I. A. Lan, S. P. Chan, Shyy-Woei Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Two pairs of detailed Nusselt number (Nu) distributions on leading (LE) and trailing (TE) endwalls together with the Fanning friction factors (f) of a rotating two-pass parallelogram channel enhanced by the detached transverse ribs are simultaneously measured under forward and backward rotations. The tested Reynolds number, rotating number, density ratio, and buoyancy number are respectively in the ranges of 5,000<Re<15,000, 0<Ro<0.3, 0.044<Δρ/ρ<0.2, and 0<Bu<0.142. Due to the accelerating flows through the gaps between the detached ribs and channel endwalls, the transverse high Nu stripe emerges along the projection area of each detached rib on both static and rotating smooth endwalls. The disparities in the relative directions between Coriolis forces and channel periphery that restrains Coriolis flows at forward and backward rotations cause different heat transfer properties on the two pairs of rotating LE and TE. The area-averaged leading and trailing Nusselt numbers at forward rotations are 0.69-1.77 and 0.85-1.98 relative to the static-channel Nusselt number references (Nu0) respectively. With backward rotations, the ratios of regionally averaged Nusselt numbers between rotating and static channels for leading and trailing walls fall in the respective change to 0.86-2 and 0.91-1.76. At both forward and backward rotations, all the f factors over LE and TE are elevated from the static-channel levels (f0) and increased by increasing Ro. Channel averaged f/f0 ratios are respectively raised to 1.21-2.21 and 1.21-2.1 at forward and backward rotations. As the heat transfer enhancements attributed to the presence of detached transverse ribs taking precedence of the accompanying f augmentations, all the thermal performance factors (TPF) are above unity in the range of 1.26-2.94. Relative to the similar rotating two-pass parallelogram channel with attached 900 ribs, the detached ribs generate the higher degrees of heat transfer enhancements with the larger extents of f augmentations.

Original languageEnglish
Title of host publicationHeat Transfer
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume5A-2018
ISBN (Print)9780791851081
DOIs
Publication statusPublished - 2018 Jan 1
EventASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway
Duration: 2018 Jun 112018 Jun 15

Other

OtherASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
CountryNorway
CityOslo
Period18-06-1118-06-15

Fingerprint

Nusselt number
Heat transfer
Coriolis force
Buoyancy
Density (specific gravity)
Hot Temperature
Reynolds number
Friction

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Liou, T. M., Huang, C. Y., Lan, I. A., Chan, S. P., & Chang, S-W. (2018). Influence of rotating directions on hydro-thermal characteristics of a two-pass parallelogram channel with detached transverse ribs. In Heat Transfer (Vol. 5A-2018). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2018-75278
Liou, T. M. ; Huang, C. Y. ; Lan, I. A. ; Chan, S. P. ; Chang, Shyy-Woei. / Influence of rotating directions on hydro-thermal characteristics of a two-pass parallelogram channel with detached transverse ribs. Heat Transfer. Vol. 5A-2018 American Society of Mechanical Engineers (ASME), 2018.
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Liou, TM, Huang, CY, Lan, IA, Chan, SP & Chang, S-W 2018, Influence of rotating directions on hydro-thermal characteristics of a two-pass parallelogram channel with detached transverse ribs. in Heat Transfer. vol. 5A-2018, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, Oslo, Norway, 18-06-11. https://doi.org/10.1115/GT2018-75278

Influence of rotating directions on hydro-thermal characteristics of a two-pass parallelogram channel with detached transverse ribs. / Liou, T. M.; Huang, C. Y.; Lan, I. A.; Chan, S. P.; Chang, Shyy-Woei.

Heat Transfer. Vol. 5A-2018 American Society of Mechanical Engineers (ASME), 2018.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Liou TM, Huang CY, Lan IA, Chan SP, Chang S-W. Influence of rotating directions on hydro-thermal characteristics of a two-pass parallelogram channel with detached transverse ribs. In Heat Transfer. Vol. 5A-2018. American Society of Mechanical Engineers (ASME). 2018 https://doi.org/10.1115/GT2018-75278